package com.xuenci.gulimall.search.service.impl;/*
 *@author:xec
 *@date:2022/5/11  13:23
 */

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.TypeReference;
import com.xuenci.common.to.es.SkuEsModel;
import com.xuenci.common.utils.R;
import com.xuenci.gulimall.search.config.GulimallElasticSearchConfig;
import com.xuenci.gulimall.search.constant.EsConstant;
import com.xuenci.gulimall.search.feign.ProductFeignService;
import com.xuenci.gulimall.search.service.MallSearchService;
import com.xuenci.gulimall.search.vo.AttrResponseVo;
import com.xuenci.gulimall.search.vo.BrandVo;
import com.xuenci.gulimall.search.vo.SearchParam;
import com.xuenci.gulimall.search.vo.SearchResult;
import org.apache.commons.lang.StringUtils;
import org.apache.lucene.search.join.ScoreMode;
import org.elasticsearch.action.search.SearchRequest;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.index.query.BoolQueryBuilder;
import org.elasticsearch.index.query.NestedQueryBuilder;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.index.query.RangeQueryBuilder;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.search.SearchHits;
import org.elasticsearch.search.aggregations.AggregationBuilders;
import org.elasticsearch.search.aggregations.bucket.nested.NestedAggregationBuilder;
import org.elasticsearch.search.aggregations.bucket.nested.ParsedNested;
import org.elasticsearch.search.aggregations.bucket.terms.ParsedLongTerms;
import org.elasticsearch.search.aggregations.bucket.terms.ParsedStringTerms;
import org.elasticsearch.search.aggregations.bucket.terms.Terms;
import org.elasticsearch.search.aggregations.bucket.terms.TermsAggregationBuilder;
import org.elasticsearch.search.builder.SearchSourceBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightField;
import org.elasticsearch.search.sort.SortOrder;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;


@Service
public class MallSearchServiceImpl implements MallSearchService {

    @Autowired
    private RestHighLevelClient client;

    @Autowired
    ProductFeignService productFeignService;

    @Override
    public SearchResult search(SearchParam param) {        // 1、动态构建出查询需要的dsl语句
        SearchResult result = null;

        // 2、准备检索请求
        SearchRequest searchRequest = buildSearchRequrest(param);
        try {
            // 3、执行检索请求
            SearchResponse response = client.search(searchRequest, GulimallElasticSearchConfig.COMMON_OPTIONS);

            // 4、分析响应数据封装成我们需要的格式
            result = buildSearchResult(response,param);
        } catch (IOException e) {
            throw new RuntimeException(e);
        }

        return result;
    }

    /**
     * 构建结果数据
     * @param response
     * @return
     */
    private SearchResult buildSearchResult(SearchResponse response,SearchParam param) {

        SearchResult result = new SearchResult();
        // 1、返回的所有查询到的商品
        SearchHits hits = response.getHits();
        List<SkuEsModel> esModels = new ArrayList<>();
        if (hits.getHits() != null && hits.getHits().length>0){
            for (SearchHit hit : hits.getHits()) {
                String sourceAsString = hit.getSourceAsString();
                SkuEsModel esModel = JSON.parseObject(sourceAsString, SkuEsModel.class);
                if (!StringUtils.isEmpty(param.getKeyword())){
                    HighlightField skuTitle = hit.getHighlightFields().get("skuTitle");
                    String string = skuTitle.getFragments()[0].string();
                    esModel.setSkuTitle(string);
                }
                esModels.add(esModel);
            }
        }
        result.setProduct(esModels);

//        // 2、当前所有商品设计到的所有属性信息
        List<SearchResult.AttrVo> attrVos = new ArrayList<>();
        ParsedNested attr_agg = response.getAggregations().get("attr_agg");
        ParsedLongTerms attr_id_agg = attr_agg.getAggregations().get("attr_id_agg");
        for (Terms.Bucket bucket : attr_id_agg.getBuckets()) {
            SearchResult.AttrVo attrVo = new SearchResult.AttrVo();
            // 得到属性的id
            long attrId = bucket.getKeyAsNumber().longValue();
            // 得到属性的名字
            String attrName = ((ParsedStringTerms) bucket.getAggregations().get("attr_name_agg")).getBuckets().get(0).getKeyAsString();
            // 得到属性的所有值
            List<String> attrValues = ((ParsedStringTerms) bucket.getAggregations().get("attr_value_agg")).getBuckets().stream().map(item -> {
                String keyAsString = item.getKeyAsString();
                return keyAsString;
            }).collect(Collectors.toList());
            attrVo.setAttrId(attrId);
            attrVo.setAttrName(attrName);
            attrVo.setAttrValue(attrValues);


            attrVos.add(attrVo);
        }
        result.setAttrs(attrVos);
//        // 3、当前所有商品设计到的所有品牌信息
        List<SearchResult.BrandVo> brandVos = new ArrayList<>();
        ParsedLongTerms brand_agg = response.getAggregations().get("brand_agg");
        for (Terms.Bucket bucket : brand_agg.getBuckets()) {
            SearchResult.BrandVo brandVo = new SearchResult.BrandVo();
            // 得到品牌的id
            long brandId = bucket.getKeyAsNumber().longValue();
            // 得到品牌的名字
            String brandName = ((ParsedStringTerms) bucket.getAggregations().get("brand_name_agg")).getBuckets().get(0).getKeyAsString();
            // 得到品牌的图片
            String brandImg = ((ParsedStringTerms) bucket.getAggregations().get("brand_img_agg")).getBuckets().get(0).getKeyAsString();
            brandVo.setBrandId(brandId);
            brandVo.setBrandName(brandName);
            brandVo.setBrandImg(brandImg);
            brandVos.add(brandVo);
        }

        result.setBrands(brandVos);
//        // 4、当前所有商品设计到的所有分类信息
        ParsedLongTerms catelog_agg = response.getAggregations().get("catelog_agg");

        List<SearchResult.CatalogVo> catalogVos = new ArrayList<>();
        List<? extends Terms.Bucket> buckets = catelog_agg.getBuckets();
        for (Terms.Bucket bucket : buckets) {
            SearchResult.CatalogVo catalogVo = new SearchResult.CatalogVo();
            // 得到分类id
            catalogVo.setCatalogId(Long.parseLong(bucket.getKeyAsString()));
            // 得到分类名
            ParsedStringTerms catalog_name_agg = bucket.getAggregations().get("catalog_name_agg");
            String catalog_name = catalog_name_agg.getBuckets().get(0).getKeyAsString();
            catalogVo.setCatalogName(catalog_name);
            catalogVos.add(catalogVo);
        }
        result.setCatalogs(catalogVos);
//        ===============以上是在聚合信息中获取的==============
//        // 5、分页信息-页码
        result.setPageNum(param.getPageNum());
//        // 5、分页信息-总记录数
        long total = hits.getTotalHits().value;
        result.setTotal(total);
//        // 5、分页信息-总页码
        int totalPages = (int)total%EsConstant.PRODUCT_PAGESIZE == 0?(int)total/EsConstant.PRODUCT_PAGESIZE:((int)total/EsConstant.PRODUCT_PAGESIZE+1);
        result.setTotalPages(totalPages);
        List<Integer> pageNavs = new ArrayList<>();
        for (int i=1;i<=totalPages;i++){
            pageNavs.add(i);
        }
        result.setPageNavs(pageNavs);

        // 6、构建面包屑导航功能
        if (param.getAttrs()!=null && param.getAttrs().size()>0){
            List<SearchResult.NavVo> collect = param.getAttrs().stream().map(attr -> {
                // 1、分析每个attrs传过来的查询参数值
                SearchResult.NavVo navVo = new SearchResult.NavVo();
                // attrs = 2_5寸：6寸
                String[] s = attr.split("_");
                navVo.setNavValue(s[1]);
                R r = productFeignService.attrInfo(Long.parseLong(s[0]));
                result.getAttrIds().add(Long.parseLong(s[0]));
                if (r.getCode() == 0) {
                    AttrResponseVo data = r.getData("attr", new TypeReference<AttrResponseVo>() {
                    });
                    navVo.setNavName(data.getAttrName());
                }else {
                    navVo.setNavName(s[0]);
                }

                // 2、取消了面包屑以后，我们要跳转到那个地方。将请求地址的URL里面的当前置空
                // 拿到所有的查询条件，去掉当前
                String replace = replaceQureyString(param, attr,"attrs");
                navVo.setLink("http://search.gulimall.com/list.html?"+replace);
                return navVo;
            }).collect(Collectors.toList());

            result.setNavs(collect);
        }

        // 品牌，分类
        if (param.getBrandId()!=null&& param.getBrandId().size()>0){
            List<SearchResult.NavVo> navs = result.getNavs();
            SearchResult.NavVo navVo = new SearchResult.NavVo();
            navVo.setNavName("品牌");
            // 远程查询所有的品牌
            R r = productFeignService.brandsInfo(param.getBrandId());
            if (r.getCode() == 0) {
                List<BrandVo> brand = r.getData("brand", new TypeReference<List<BrandVo>>() {
                });
                String replace = "";
                StringBuffer buffer = new StringBuffer();
                for (BrandVo brandVo : brand) {
                    buffer.append(brandVo.getBrandName()+";");
                    replace = replaceQureyString(param, brandVo.getBrandId()+"","brandId");
                }
                navVo.setNavValue(buffer.toString());
                navVo.setLink("http://search.gulimall.com/list.html?"+replace);
            }

            navs.add(navVo);
        }
        // TODO 分类：不需要导航取消

        return result;
    }

    private String replaceQureyString(SearchParam param, String value,String key) {
        String encode = null;
        try {
            encode = URLEncoder.encode(value, "UTF-8");
            encode.replace("+","%20");  // 浏览器对空格的编码和java不一样
        } catch (UnsupportedEncodingException e) {
            throw new RuntimeException(e);
        }
        String replace = param.get_queryString().replace("&"+key+"=" + encode, "");
        return replace;
    }

    /**
     * # 模糊匹配，过滤（按照属性，分类，品牌，价格区间，库存），排序，分页，高亮，聚合分析
     * 准备检索请求
     * @return
     */
    private SearchRequest buildSearchRequrest(SearchParam param) {
        SearchSourceBuilder sourceBuilder = new SearchSourceBuilder();  // 构建DSL语句的

        /**
         * 模糊匹配,过滤（按照属性，分类，品牌，价格区间，库存）
         */
        // 1、构建bool - query
        BoolQueryBuilder boolQuery = QueryBuilders.boolQuery();
        // 1.1、must
        if (!StringUtils.isEmpty(param.getKeyword())){
            boolQuery.must(QueryBuilders.matchQuery("skuTitle",param.getKeyword()));
        }
        // 1.2、bool - filter - 按照三级分类id查询
        if (param.getCatalog3Id()!=null){
            boolQuery.filter(QueryBuilders.termQuery("catalogId",param.getCatalog3Id()));
        }
        // 1.3、bool - filter - 按照品牌id查询
        if (param.getBrandId() != null && param.getBrandId().size()>0) {
            boolQuery.filter(QueryBuilders.termsQuery("brandId",param.getBrandId()));
        }
        // 1.4、bool - filter - 按照所有指定的属性进行查询
        if (param.getAttrs() != null && param.getAttrs().size()>0){
            for (String attrStr : param.getAttrs()) {
                BoolQueryBuilder nestedboolQuery = QueryBuilders.boolQuery();
                // attr = 1_5存：8寸
                String[] s = attrStr.split("_");
                String attrId = s[0];  // 检索的属性id
                String[] attrValue = s[1].split(":");  // 这个属性的检索的值
                nestedboolQuery.must(QueryBuilders.termQuery("attrs.attrId",attrId));
                nestedboolQuery.must(QueryBuilders.termsQuery("attrs.attrValue",attrValue));
                // 每一个都必须生成一个nested查询
                NestedQueryBuilder nestedQuery = QueryBuilders.nestedQuery("attrs", nestedboolQuery, ScoreMode.None);
                boolQuery.filter(nestedQuery);
            }
        }

        // 1.5、bool - filter - 按照库存是否有进行查询
        if (param.getHasStock() != null){
            boolQuery.filter(QueryBuilders.termQuery("hasStock",param.getHasStock()==1));
        }

        // 1.6、bool - filter - 按照价格区间
        if (!StringUtils.isEmpty(param.getSkuPrice())){
            // 1_500/_500/500_
            RangeQueryBuilder rangeQuery = QueryBuilders.rangeQuery("skuPrice");

            String[] s = param.getSkuPrice().split("_");
            if (s.length == 2){
                // 区间
                rangeQuery.gte(s[0]).lte(s[1]);
            }else if (s.length == 1){
                if (param.getSkuPrice().startsWith("_")){
                    rangeQuery.lte(s[0]);
                }
                if (param.getSkuPrice().endsWith("_")){
                    rangeQuery.gte(s[0]);
                }
            }

            boolQuery.filter(rangeQuery);
        }

        // 把以前的所有条件都拿来封装
        sourceBuilder.query(boolQuery);

        /**
         * 排序，分页，高亮
         */
        // 2.1、排序
        if (!StringUtils.isEmpty(param.getSort())){
            String sort = param.getSort();
            String[] s = sort.split("_");
            SortOrder order = s[1].equalsIgnoreCase("asc")?SortOrder.ASC:SortOrder.DESC;
            sourceBuilder.sort(s[0], order);
        }

        // 2.2、分页  pageSize：5
        // pageNum:1  from:0  size:5  [0,1,2,3,4 ]
        // from = (pageNum-1)*size
        sourceBuilder.from((param.getPageNum()-1)*EsConstant.PRODUCT_PAGESIZE);
        sourceBuilder.size(EsConstant.PRODUCT_PAGESIZE);

        // 2.3、高亮
        if (!StringUtils.isEmpty(param.getKeyword())){
            HighlightBuilder builder = new HighlightBuilder();
            builder.field("skuTitle");
            builder.preTags("<b style='color:red'>");
            builder.postTags("</b>");
            sourceBuilder.highlighter(builder);
        }

        /**
         * 聚合分析
         */

        // 1、品牌聚合
        TermsAggregationBuilder brand_agg = AggregationBuilders.terms("brand_agg");
        brand_agg.field("brandId").size(50);

        // 1.1）、品牌聚合的子聚合
        brand_agg.subAggregation(AggregationBuilders.terms("brand_name_agg").field("brandName").size(1));
        brand_agg.subAggregation(AggregationBuilders.terms("brand_img_agg").field("brandImg").size(1));
        // TODO 聚合brand
        sourceBuilder.aggregation(brand_agg);
        // 2、分类聚合  catalog_agg
        TermsAggregationBuilder catelog_agg = AggregationBuilders.terms("catelog_agg").field("catalogId").size(20);
        catelog_agg.subAggregation(AggregationBuilders.terms("catalog_name_agg").field("catalogName").size(1));
        // TODO 聚合catalog
        sourceBuilder.aggregation(catelog_agg);

        // 3、属性聚合
        NestedAggregationBuilder attr_agg = AggregationBuilders.nested("attr_agg", "attrs");

        // 聚合出当前所有的attrId
        TermsAggregationBuilder attr_id_agg = AggregationBuilders.terms("attr_id_agg").field("attrs.attrId");
        // 聚合分析出当前attr_id对应的名字
        attr_id_agg.subAggregation(AggregationBuilders.terms("attr_name_agg").field("attrs.attrName").size(1));
        // 聚合分析出当前attr_id对应的所有可能的属性值attrValue
        attr_id_agg.subAggregation(AggregationBuilders.terms("attr_value_agg").field("attrs.attrValue").size(50));
        attr_agg.subAggregation(attr_id_agg);
        // TODO 聚合attr
        sourceBuilder.aggregation(attr_agg);

        String string = sourceBuilder.toString();
        System.out.println("构建的DSL"+string);

        SearchRequest searchRequest = new SearchRequest(new String[]{EsConstant.PRODUCT_INDEX}, sourceBuilder);

        return searchRequest;
    }
}
